Two-Dimensional Exact Analytical Solution of Armature Reaction Field in Slotted Surface Mounted PM Radial Flux Synchronous Machines

2009 ◽  
Vol 45 (10) ◽  
pp. 4534-4538 ◽  
Author(s):  
A. Bellara ◽  
Y. Amara ◽  
G. Barakat ◽  
B. Dakyo
Keyword(s):  
Analytical Solution ◽  
Exact Analytical Solution ◽  
Synchronous Machines ◽  
Two Dimensional ◽  
Reaction Field ◽  
Radial Flux ◽  
Armature Reaction

The Armature Reaction Inductive Reactances of Synchronous Machines with Permanent Magnets Nonmagnetic Holder

2021 ◽  
pp. 45-57
Author(s):  
Sergey V. ZHURAVLEV ◽  
◽  
Boris S. ZECHIKHIN ◽  
Nikolay S. IVANOV ◽  
◽  
...  
Keyword(s):  
Magnetic Field ◽  
Analytical Solution ◽  
Permanent Magnets ◽  
Form Factors ◽  
Magnetic Core ◽  
Synchronous Machines ◽  
Permanent Magnet Machines ◽  
Electromagnetic Excitation ◽  
Design Scheme ◽  
Armature Reaction

The most widely used design scheme of synchronous machines with radially magnetized permanent magnets and a nonmagnetic magnet holder is considered. To calculate the armature reaction inductive reactances in these machines, it is proposed to use the conventional approach and the expressions obtained on its basis for the armature reaction inductive reactances of synchronous machines with electromagnetic excitation. The features of permanent magnet machines can be taken into account by special calculated coefficients included in these expressions. On the basis of the magnetic field analytical solution of the armature reaction, the special calculated coefficient for the design scheme with a cylindrical yoke of the inductor was determined taking into account the increased nonmagnetic gap between the armature magnetic core and inductor yoke core. By applying the Schwartz method with the use of a scalar magnetic potential, a new magnetic field analytical solution of the armature reaction with a polyhedral yoke of the inductor is obtained. On the basis of this solution, the field form factors of the longitudinal and transverse armature reaction were determined, which take into account the real geometry of this design scheme. Graphical dependences of the special calculated coefficients on the active zone geometric parameters are given.

scholarly journals The exact analytical solution for the gas lubricated bearing in the slip and continuum flow regime

2012 ◽  
Vol 91 (105) ◽  
pp. 83-93 ◽  
Author(s):  
Nevena Stevanovic ◽  
Vladan Djordjevic
Keyword(s):  
Analytical Solution ◽  
Flow Rate ◽  
Gas Flow ◽  
Exact Analytical Solution ◽  
The Other ◽  
Two Dimensional ◽  
Lubrication Equation ◽  
Continuum Flow ◽  
Independent Variable ◽  
The Continuum

The exact analytical solution for the compressible two-dimensional gas flow in the microbearing is presented. The general slip-corrected Reynolds lubrication equation is derived and it is shown that it possesses an exact analytical solution. It is obtained by a suitable transformation of the independent variable, and it provides the pressure distribution in the bearing as well as the mass flow rate through it. By neglecting the rarefaction effect, this solution is also applicable to the continuum gas flow in the bearing, which also does not exist in the open literature. The obtained analytical solution can be usefully applied for testing the other, experimental or numerical results.

scholarly journals Modular Permanent Magnet Synchronous Machine with Low Space Harmonic Content

Energies ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3924 ◽  
Author(s):  
Keyi Wang ◽  
Heyun Lin
Keyword(s):  
Permanent Magnet ◽  
Synchronous Machines ◽  
Permanent Magnet Synchronous Machines ◽  
Magnetomotive Force ◽  
Space Harmonic ◽  
Reaction Field ◽  
Harmonic Content ◽  
Three Phase ◽  
Armature Reaction ◽  
Electromagnetic Characteristics

Modularity technique is desirable in large permanent magnet synchronous machines (PMSMs) because it facilitates manufacture, assembly, and maintenance. Although the PMSMs with fractional-slot concentrated windings (FSCWs) allow their stators to be modularized, they usually suffer from high nonworking space harmonic content. The PMSMs with various reported two-slot pitch windings (TSPWs) show much lower nonworking space harmonic content, but they do not support stator modularity. This paper proposes a modular PMSM with a special dual three-phase (DTP) TSPW, which exhibits quite low nonworking space harmonic content. First, the topology of the proposed machine is described in detail. Then, the mechanism of reducing the nonworking space harmonic content of the machine is expounded through winding magnetomotive force (MMF) analysis. Finally, the electromagnetic characteristics of a specific proposed modular PMSM and a conventional modular PMSM with DTP-FSCW are compared by finite element method (FEM), in terms of electromotive force (EMF), armature reaction field, torque performance, efficiency and power factor. The FEM results demonstrate that the proposed machine can realize low space harmonic content while retaining stator modularity.

An Exact Analytical Solution of Halbach Arrays Permanent-Magnet Motor for Magnetic Field on Load

2013 ◽  
Vol 416-417 ◽  
pp. 58-65 ◽  
Author(s):  
Chen Li ◽  
Hang Zhang ◽  
Li Bing Jing ◽  
Yue Jin Zhang ◽  
Jie Bao Li
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Flux Density ◽  
Analytical Method ◽  
Exact Analytical Solution ◽  
Air Gap ◽  
Reaction Field ◽  
Armature Reaction ◽  
Air Gap Magnetic Field ◽  
Halbach Arrays

An exact analytical model of Halbach arrays permanent-magnet (PM) motor is established for the calculation of air-gap magnetic field on load in this paper. The exact analytical method is based on the resolution of Laplaces or Poissons equations by applying the boundary conditions on the interface between each sub-domain: air-gap, Halbach arrays and slots. The waveforms of no-load magnetic field flux density, back electromotive force (EMF), armature reaction field flux density, air-gap magnetic field flux density on load and electromagnetic torque, which computed by the analytical method were validated through the finite-element method (FEM).

Sign in / Sign up

Export Citation Format

Share Document